The greengroceries and the onion are peeled and washed. The cauliflower is cleaned, it is broken into bouquets and washed. It is kept into salt water and vinegar for 30 minutes. The eggs are washed, disinfected, passes through a cold water jet. The flour is bolted and diluted in cold water.
The cauliflower, the greengroceries and the onion are boiled in salt water. After boiling, a part of the cauliflower bouquets are put aside. They are blended. The soup is added. It is prepared the mixture of egg yolks and it is introduced in the pottage pot and boiled for 5 to 10 more minutes. The butter is added.